1. Choose all valid hosts address range for subnet 15.242.55.32/27 A. 15.242.55.31-15.242.55.62 B. 15.242.55.32-15.242.55.63 C. 15.242.55.33-15.242.55.62 D. 15.242.55.33-15.242.55.63 E. 15.242.55.33-15.242.55.64 Answer : C /27 = 32 – 27 = 5 jadi 2^5 = 32 Kelipatan Network ID : 0, 32, 64, 96, 128 … s/d 224 (256 tidak valid karena sudah maksimum) Network ID : 15.242. 55.32 subnet mask 255.255.255.224 Alokasi IP Valid : 15.242. 55.33 - 15.242. 55.62 IP Broadcast : 15.242. 55.63 2. How many usable IP addresses are there in a 20-bit subnet (/20) a. 2047 b. 4096 c. 2048 d. 2046 e. 4094 Answer : E /20 = 32 – 20 – 12 jadi 2^12 = 4096 Untuk jumlah Host valid dikurangi broadcast & network jadi 4096 – 2 = 4094 3. Which ones of the following are valid IP addresses? a. 192.168.13.255 b. 1.27.14.254 c. 10.10.14.0 d. 192.168.256.1 e. 127.0.0.1 Answer : B Jawaban A IP 255 adalah broadcast tdk valid, C tdk valid IP nol, D tdk valid IP 256, E adalah IP localhost 4. Which of the following is NOT a valid MAC Address? a. 95:B5:EE:78:8A b. 13:16:86:53:89:43 c. 80:GF:AA:67:13:5D d. 88:0C:00:99:5F:EF e. EA:BA:AA:EE:FF:CB
Answer : A & C A MAC Address minimal mempunyai 48 bit dimana 1 huruf/angka mewakili 4 bit C Dalam Hexadesimal tidak ada alphabet G, yang ada hanya A,B,C,D,E,F 5. The basic unit of a physical network (OSI Layer 1) is the: a. Byte b. Frame c. Bit d. Header e. segment Answer : C Layer 1 / fisik berhubungan dengan kabel, kartu jaringan & konektor jadi yang lewat adalah data murni yang masih berupa bit (binary digit) 6. Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data? A. Application B. Presentation C. Session D. Transport E. Network Answer : D Layer 4 transport menjaga pengiriman paket dari sumber ke pengirim / ent-to-end 7. Which statement about MAC addresses is accurate? a. A MAC address is a number in hexadecimal format that is physically located on the NIC. b. A MAC address is represented by binary digits that are organized in pairs. c. It is not necessary for a device to have a unique MAC address to participate in the network. d. The MAC address can never be changed Answer : A Alamat MAC merupakan alamat mesin yang tertanam di dalam perangkat kartu jaringan / Network Interface Card berisi kode vendor ank kode unik 8.Which two of these addresses are private IP addresses? (Choose two.) a. 10.215.34.124 b. 172.25.71.43
c. 172.200.10.10 d. 225.200.15.10 e.220.154.57.34 Answer : A & B Daftar IP Privat sbb : 10.x.x.x 172.16.x.x s/d 172.32.x.x 192.168.x.x 9.What is the purpose of a router? a. To interconnect networks and choose the best paths between them b. To provide the connection points for the media c. To serve as the endpoint in the network, sending and receiving data d. To provide the means by which the signals are transmitted from one networked device to another e. Switching only Answer : A Tugas utama router adalah menghubungkan / interconnect antar jaringan yang berbeda segmen dan menunjukkan rute terbaik 10.Which of the following factors are typical causes of network congestion? (Choose three.) a. High-bandwidth applications b. Many network segments c. Increasing volume of network traffic d. More powerful computer and network technologies e. Few network segments Answer : A,B,C Penyebab jaringan macet : A Aplikasi dengan bandwidth tinggi seperti video streaming youtube B Terlalu banyak segmen jaringan sehingga trafik terlalu padat jika tidak menggunakan VLAN atau router C Peningkatan kapasitas trafik yang disebabkan semakin banyak user dan data berukuran besar yang lewat 11.Which of the following characteristics apply to a switch? (Choose three.) a. Uses a table of MAC addresses to determine the port to which the data is to be sent b. Connects LAN segments
c. Reduces the number of collision domains d. Increases the number of collision domains e. Filters data before forwarding it to its destination on the network Answer : A,B,D A Switch adalah perangkat layer 2 OSI yang bertugas mengumpulkan informasi alamat mesin / MAC Address yang nantinya berfungsi dalam meneruskan frame data sesuai pintu/port yang sesuai dengan MAC Address B Switch menghubungkan banyak segmen LAN D Switch meningkatkan jumlah collision domain, dimana jumlah collision domain = jumlah port di switch tsb yang berarti jumlah jalan yang tersedia lebih banyak sehingga resiko terjadi tabrakan trafik jaringan jauh lebih rendah, missal switch 24 port akan memiliki 24 collision domain 12.Which two statements accurately describe WANs? a. The companies in which WANs are implemented usually own the WANs. b. WANs connect devices that are separated by wide geographic areas. c. WANs use the services of carriers such as telephone companies, cable companies, satellite systems, and network providers. d. WANs generally carry limited types of data at high speeds. e. WANs use serial connections of various types to provide access to bandwidth. Answer : B,C B Inti dari WAN adalah menghub perangkat dalam area geografis yg luas C Layanan WAN bersifat sewa dari pihak ketiga yaitu penyedia layanan / service provider seperti ISP, karena tidak dimungkinkan untuk membangun infrastruktur dengan cakupan area yang luas 13.Which three communications needs do WANs address? a. Workers in a small business need to be able to communicate and share data with each other. b. Administrative staff within a school need to share schedule information with the teachers. c. Organizations often want to share information with other organizations across large distances. d. Students need to do research for classes by accessing library indexes and publications located in other parts of their country and in other parts of the world. e. Workers within a branch of a large company need to share project data with each other. Answer : C,D,E Inti dari WAN adalah menghubungkan perangkat di area yang luas/jauh C Berbagi informasi antar Kantor sebuah organisasi dengan cabang lainnya D Pelajar yang mengakses perpustakaan online di Negara lain
E
Pekerja di sebuah kantor cabang yang ingin berbagi data dengan user di cabang lain
14. Which two statements accurately describe the difference between LANs and WANs? a. A WAN transmits data faster than a LAN. b. A LAN transmits data faster than a WAN. c. Whereas a LAN connects computers, peripherals, and other devices in a single building or other small geographic area, a WAN transmits data across broad geographic distances. d. A company or organization usually owns the hardware and software required for WANs. e. LANs span large geographic areas if a LAN administrator configures them correctly. Answer : B,C B WAN identik dengan sewa pihak ketiga atau ISP yang berarti bandwidth besar = harga mahal sedangkan LAN bersifat local dan dikelola sendiri sehingga bandwidth jauh lebih besar & gratis C LAN bersifat local & area terbatas sedangkan WAN cakupan area lebih luas dengan jarak yang lebih jauh 15.In a Class B address, which of the octets are the host address portion and are assigned locally? a. The first octet is assigned locally. b. The first and second octets are assigned locally. c. The second and third octets are assigned locally. d. The third and fourth octets are assigned locally. Answer : D Kelas B memiliki default subnet mask 255.255.0.0 jadi yang valid untuk alokasi host adalah octet ke tiga dan ke empat (1 oktet = 8 bit) 16.Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two) A. The presentation layer translates bits into voltages for transmission across the physical link. B. The transport layer divides a data stream into segments and adds reliability and flow control information. C. Packets are created when the network layer adds Layer 3 addresses and control information to a segment. D. The data link layer adds physical source and destination addresses and an FCS to the segment. E. Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information
Answer : B & E Benar B Layer 4 transport membagi aliran data menjadi segmen dan menambahkan control informasi aliran & Kendalan E Layer 3 network melakukan pembungkusan dari layer dibawahnya dari frame menjadi paket dan menambahkan alamat IP (Host IP address) dan informasi control protocol Salah : A Layer presentation tidak berhubungan dengan bit & voltage C Paket dibuat berdasarkan frame dari layer dibawahnya bukan setelah di tambahkan control informasi ke sebuah segmen D Layer data link tidak berhubungan dengan segment tetapi frame 17.Which network mask should be used for point-to-point WAN links (interconnect two routers) in order to reduce waste of IP addresses? A. /24 B. /30 C. /27 D. /26 E. /32 Answer : B /30 = 32 – 30 = 2 jadi jumlah host 2^2 – 2 = 2 Untuk menghubungkan 2 router cukup membutuhkan 2 IP saja karena point to point /30 atau misal : Router1 = 192.168.1.1 subnet mask 255.255.255.252 Router2 = 192.168.1.2 subnet mask 255.255.255.252 18.What is the maximum number of IP addresses that can be assigned to hosts on a subnet that uses the 255.255.255.224 subnet mask? A. 14 B. 15 C. 16 D. 30 E. 31 Answer : D 256 – 224 = 32 Valid Host 32 – 2 = 30 19.Company A is migrating to a private IP addressing scheme. Which of the following describe the use of private IP addresses? (Choose two) A. Addresses chosen by Company A to communicate with the Internet.
B. Addresses that cannot be routed through the public Internet. C. Addresses that can be routed through the public Internet. D. A scheme to conserve public addresses. E. Addresses licensed to enterprise or ISPs by an Internet registry organization. Answer : B, D B IP Privat tidak akan pernah di routing keluar menuju ke jaringan public internet (hanya untuk area local / LAN) D Penggunaan IP Privat akan menghemat / conserve IP Publik yang terbatas
20.You are a systems administrator and you are about to assign static IP addresses to various servers on your network. For the network 192.168.20.24/29 the router is assigned to the first usable host address, while the last usable host address goes to your Sales server. Which one of the following commands would you enter into the IP properties box of the sales server? A. IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9 B. IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1 C. IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25 D. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.17 E. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.25 Answer : C /29 maka jumlah bit yang bernilai 1 = 8 + 8 + 8 + 5 Julah bit yang bernilai 1 sebanyak 5 = 128+64+32+16+8 = 248 Subnet mask 255.255.255.248 Maka subneting kelipatan 8 8, 16, 24, 32 dst
Jadi 192.168.20.25 s/d 192.168.20.30 valid IP 192.168.20.24/29 network ID 192.168.20.25/29 IP Router 192.168.20.30/29 IP Server Sales 192.168.20.31/29 Broadcast
192.168.20.32/29
network ID kelipatan berikutnya
